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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b78aee0729228f7f8a9336ac26c8ae9509d15a772da601d6329645d1ab43503' 
  AND token = 'kz5F3h35OfUqaBde0COH1mQTvLNb31HFk5DK0omMfrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}